21202012210210 has 16 divisors (see below), whose sum is σ = 41099285207736. Its totient is φ = 7828435277568.

The previous prime is 21202012210187. The next prime is 21202012210231. The reversal of 21202012210210 is 1201221020212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17172827168121 + 4029185042089 = 4144011^2 + 2007283^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81546200679 + ... + 81546200938.

Almost surely, 2^{21202012210210} is an apocalyptic number.

21202012210210 is a deficient number, since it is larger than the sum of its proper divisors (19897272997526).

21202012210210 is a wasteful number, since it uses less digits than its factorization.

21202012210210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163092401637.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202012210210 its reverse (1201221020212), we get a palindrome (22403233230422).

The spelling of 21202012210210 in words is "twenty-one trillion, two hundred two billion, twelve million, two hundred ten thousand, two hundred ten".